Machine for molding building blocks and the like



March 2,1926. 1,514,753

JF. BONNET MACHINE FORMOLDING BUILDING BLOCKS AND THE LIKE Filed April 29, 1924 2 Sheets-Sheet 1 March 2 1926.

. F. BONNET MACHINE FOR MOLDING BU ILDINGBLOCKS AND THE LIKE 311 April 29, 1924 2 Sheets-Sheet 2 Za re 71268 .7;en;azfr zadnef w 5 V V Patented Mar. 2, 1926.

UNITED STATES PATENT OFFICE. I

FRANQOIS BONNET, OF VILLEERANCHESUR-SAONE, FRANCE.

MACHINE FOR MOLDING BUILDING BLOCKS AND THE LIKE.

Application filed April 29, 1924. Serial No. 709,869.

Machines for molding concrete and like blocks at present in operation, wherein'the pressure exerted on the material is obtained mechanically by ramming it into a mold mounted on a fixed plate yield, from the manufacturing point of view, remarkable results, but the extrication of the molded block requires laborious manipulation by hand involving appreciable loss of time.

The automatic apparatus for the e ection of molded blocks which constitutes the subject matter of this invention avoids the drawbacks of extrication by hand and permits of a marked increase in output, while simultaneously conducing to greater facility and evenness in operation.

The apparatus is characterized by the combination of the two following mechanical movements:

1. Automatic ejection of the molded block by the vertical displacement of an ejector plate or disc operated by lever and rod mechanism which is actuated by a crank disc as it completes a rotation under the influence of suitable actuating mechanism.

2. The projection of a roller-support beneath the molded block so as to allow of its removal after quitting the ejector plate, this projection movement being obtained by mechanism comprising levers and rods actuated at the exact moment of ejection of the molded block.

The annexed drawing illustrates an example of construction of the invention.

Fig. 1 represents a front view of the exterior of a molding machine, when idle and provided with the ejection apparatus.

Fig. 2 is a section on line A B C of Fig. 1.

Fig. 3 is a vertical longitudinal section of the machine, the members of which are in positions corresponding to the moment of 50 maximum ejection. v

Fig. 4 is a detail View showing the position of a column for elevating the mold ter compression of the material.

Fig. 5 is a transverse view through the upper part of the mold at the moment when the ing of the roller support has begun to grip the molded material from below.

Fig. 6 1s a plan view showing the rollers arranged above the mold for the liberation of the blocks when molded.

Fig. 7 is a detail view showing the mountparts of a driving connection involved.

The molding machine on which the ejector apparatus is shown is of the known type.

This machine comprises a body or frame a within which works vertically, under the influence of a cam Z), a piston 0 which terminates in a plate 0 on which rests a mold (Z and a movable base 0. The mold (Z which is secured centrally on the plate 0 by guides d is stopped at its upper extremity by the cover which is provided with the usual locking device.

A slide block f movable base e by means of the pillars c and the re-raising of the mold d by means of the pillars d which constitute buttresses and are housed in the recesses f made in the upper part of the frame a.

The mechanism which controls the ramming of the mold consists of a hollow shaft g turning in the bushes g which are fitted in the openings a of the frame a of the machine. Between the openings is arranged the compression cam b which is integral with the hollow spindle g the rotation of which is effected by automatic engaging means consisting"- of a disc 9" whose driving pins 51 are connected by a belt 7; to the similar pins it ofa driving pulley h. The two setsof pins are disposed in alternating or staggered relation to each other, and the belt is here shown aspassing under the pins It on the pulley 7t and under the pins 9 on the disc, so to speak, so that the pins it act directly on the belt during the rotation of the pulley and the belt, in turn, acts directly on the pins 9, the belt thus con stituting an elastic connection between the pulley and the disc.

The block ejecting apparatus comprises a shaft 2' secured centrally within the hollow shaft 9 by roller bearings '11. To one end of the shaft 2' is keyed a driving pulley 71" while the other extremity, mounted centrally in the frame a carries a worm j which actuates a worm wheel j the spindle j of which turns in a bearing a? in the frame a.

The front face of the wheel j comprises effects the raising of the a female clutch 70 with which can engage a male lut h. is. formed on, the. extremity of a collar 7a which ispres'sed' forward on a shaft Z by a spring Z. The collar lq" carries a sloped bearing ring on which can bear on a pin m, the la'tterbeingagain pulled downwards by a finger m which. formsan integral partof'a lever 11. subject to the tension of a spring n (Fig-, 1),. I

To the outer extremity of the shaft Z is keyed, a crank. disc o carrying, an axle, pin placed ecc'entrically and actuatinga rod. which turnsa spindlep, by: the means of a lever 72. The spindlev pf causes the rocking of a lever g, integral with it. the two branches of whichalfe providedwith rollers g on which rest the stirrups f secured to the underside of the slide block f andon eitherside of the pistona (Fig. 3)

Onthe periphery of-. the ;,cra;nk diseois a cam 0", Fig, 1, whichproduces;abrupt rocking of afdouble-armed lever 1', 1* provided with a friction roller. 9 and; pivot-ally mounted ona fixed axis-9 (Fig; 1-). The arm 7" of the lever, actuates a rods which is connected by. a. pin 8 to. a verticaliod t which, at itsfoot, canrock in a support 2,? and is, at its upper extremity, pivoted on. an axle a mounted in cheeks u integral with the bar u. At the front end'o-f. each bar. a is mounted a tube; or e-l'OllGl' a while their rear extremities are; supported on. rods '0 mounted inthe samemanner as-rods-u and forming with the. latter a jointed parallelos gram.

The movable ejector basee (Fig. islprovided in. its upper part with two longitu: dinal recesses w. andwhich forms means :for engaging thebars n.

Lastly, a roller, track comprising; the rollersy is arranged behind themold 61 to receive the molded blocks asthey are produced.

The operationof themoldingmachine is as usual witln respect to the compressionof the substance. in. the mold; This first .opera-. tion is effected by the pulley h which, actu-. ates the hollow spindle g and produces rota.- tion of the cam 7). Then the compression is finished and the mold (Z has'come torest on the plate 0 of thepistomthe workman produces disengagement by causing the driving: belt. topass from the pulleyh to the pulley 2' and .the plate 0 thus becomes stationary and it is easy to lift the cover ofv the-mold after disengaging the locking device.

The extrication of the molded product is effected atthis. moment by simply exerting a push on the lever .12 in the direction of the arrow; the pulley i when driven by the belt causing theirotationof, thecentral shaft 1' and consequently also of the worm .j and the worm wheel Reversal of the, lever. 72. lifts .the-pinmd whichi thus clears the I slgpe of ,thegringym and permits the clutch member 7a by the push of the spring Z to engage with the clutch member In. The. result is that the shaft Z is actuated and rotates quickly through one turn only as the pin m being pushed by" the spring it" falls back into the receding portion of the slope m which is carried to the'rear when the boss returns into contact .with; the axis m. it this moment the parts m and 7c are again disengaged and the shaft Z becomes stationary.

This; single; revolution of the crank disc 0. integral with the shaftl produces, by meansofthe. rod .32 andtheleversp and 9 an. ascendingand descending movement of the: slide block f. As it ascends the block f first raises,,by; means of the pillars. e the movable base a on which the molded block rests-and then-towardsthe end of its movement, it pushesv the mold d by means of-the small pillars d Exactly at the moment when the crank disc o has executed a half rotation and the base 6; has: reached its maximum-elevation, the cam c. whichhas been displaced in the direction of the arrow (Fig. 1) meets the roller? of the lever 7' and causes it to rock. 'lheresultis to move abruptly forward the bars 1d, andto cause them toengage inthc grooves 00 of-the. movable base 6 below the plate which carriesthe molded block, which is thus held above the mold (Z in spite of the immediatedescent of the base 0. All that is then required is to push the molded block onto the roller way 3 when it is carried away from the machine;

The Workman now pushesbackthe bars a refills=the moldedand. after closing the cover, d .puts 1 the pulley: h intov engagement. and commences another molding op eration.

hat I claim as my invention and desire to secure 'by-LettersPa-tent ofthe United States is 1- In a molding apparatus of the character described, an ejector plate for themolded block, a crank disc, means for rotating said crank disc, means for governing. the rotation of said L crank. disc, means operated by said crank disc for raising said ejectorplatc and thereby said block from the molding box of the apparatus, recesses in the upper surface'of said. ejector plate, rollers-adapted to rotate in saidrecessesand 'means for introducing said rollers into said recesses or withdrawingthem therefrom.

2. In aimoldingapparatus of the character described, a :shaft, a: driving pulley mountednat one extremitythereof, atworm on said shaft, a worm wieel gearingtherewith, a crank disc, a-clutch adapted to con nect said crankl disc to said worm wheel, means for operating said clutch, vertical guiderodsconnected to said ejector plate, a pistonvconnectedto said guide: rods, means for guiding said rods, and lever mechanism connecting said crank disc to said piston to raise and lower the latter and thereby said ejector plate. I

In a molding apparatus of the charac ter described, a shaft, a driving pulley mounted at one extremity thereof, a worm on said shaft, a Worm Wheel gearing therewith, a crank disc, a clutch adapted to connect said crank disc to said Worm Wheel, means for operating said clutch, vertical guide rods connected to -said ejector plate, a piston connected to said guide rods, means for guiding said rods, lever mechanism connecting said crank disc to said piston, a cam on the periphery of said crank disc, a bell crank lever rocked by said cam by the rotation of said disc, a horizontal framing, rollers carried on bars of said framing and means operated by said bell crank lever adapted to introduce said rollers into recesses in the upper surface of the ejector plate or Withdraw them therefrom.

In Witness whereof I have signed this specification.

FRANQOIS BONNET, 

